Dewaxing catalyst with improved aromatic saturation activity
Methods are provided for dewaxing distillate feeds using a dewaxing catalyst with improved aromatic saturation activity. The dewaxing can be performed using a catalyst including a zeolitic molecular sieve with a beneficial ratio of zeolitic molecular sieve to binder and/or using a catalyst including a zeolitic molecular sieve with a reduced ratio of silica to alumina.
1. A method of dewaxing a feed, comprising:
exposing a feed comprising a lubricant boiling range portion, the feed having an aromatics content of at least 5 wt % and an organic sulfur content of at least 50 wppm, to a dewaxing catalyst under effective dewaxing conditions to form a dewaxed effluent, the dewaxing catalyst comprising a zeolitic molecular sieve, a mesoporous binder, and at least 0.1 wt % of a Group VIII metal, the dewaxing catalyst have a ratio of zeolitic molecular sieve to binder of at least 75:25,
wherein the dewaxing catalyst has a density of less than 0.52 g/cm 3 .
2. The method of claim 1 , wherein the zeolitic molecular sieve comprises a molecular sieve having a ZSM-48 framework, a molecular sieve having a silica to alumina ratio of 70:1 or less, or a combination thereof.
3. The method of claim 1 , wherein the zeolitic molecular sieve comprises a molecular sieve having a largest pore channel size corresponding to a 10-member ring.
4. The method of claim 1 , wherein the zeolitic molecular sieve has a silica to alumina ratio of 60:1 to 70:1.
5. The method of claim 1 , wherein the zeolitic molecular sieve has a silica to alumina ratio of 50:1 to 60:1.
6. The method of claim 1 , wherein the zeolitic molecular sieve has a silica to alumina ratio of 40:1 to 50:1.
7. The method of claim 1 , wherein the zeolitic molecular sieve has a silica to alumina ratio of 30:1 to 40:1.
8. The method of claim 1 , wherein the dewaxing catalyst has a ratio of zeolite to binder of 75:25 to 85:15.
9. The method of claim 1 , wherein the dewaxing catalyst comprises 0.1 wt % to 2.0 wt % of a Group VIII noble metal.
10. The method of claim 9 , wherein the Group VIII noble metal comprises Pt, Pd, or a combination thereof.
11. The method of claim 1 , wherein the mesoporous binder comprises silica, alumina, silica-alumina, titania, silica-titania, alumina-titania, zirconia, silica-zirconia, titania-zirconia, ceria, tungsten oxide, and combinations thereof.
12. The method of claim 1 , wherein the feed has a sulfur content of 100 wppm to 1000 wppm and an aromatics content of at least 10 wt %.
13. The method of claim 1 , wherein the feed has a T5 boiling point of at least 600° F. (316° C.), a T95 boiling point of 1100° F. (593° C.) or less; or a combination thereof.
14. The method of claim 1 , wherein the feed comprising a lubricant boiling range portion comprises a hydrotreated effluent, a hydrocracked effluent, or a combination thereof.